/*
* @Copyright (c) 2010 Ricardo Andrietta Mendes - eng.rmendes@gmail.com
* 
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
* 
* How to use it:
* var formated_value = $().number_format(final_value);
* 
* Advanced:
* var formated_value = $().number_format(final_value, 
*                                                                                                       {
*                                                                                                       numberOfDecimals:3,
*                                                                                                       decimalSeparator: '.',
*                                                                                                       thousandSeparator: ',',
*                                                                                                       symbol: 'R$'
*                                                                                                       });
*/
//indica que está sendo criado um plugin
jQuery.fn.extend({ //indica que está sendo criado um plugin
        
        number_format: function(numero, params) //indica o nome do plugin que será criado com os parametros a serem informados
                { 
                //parametros default
                var sDefaults = 
                        {                       
                        numberOfDecimals: 2,
                        decimalSeparator: ',',
                        thousandSeparator: '.',
                        symbol: ''
                        }
 
                //função do jquery que substitui os parametros que não foram informados pelos defaults
                var options = jQuery.extend(sDefaults, params);

                //CORPO DO PLUGIN
                var number = numero; 
                var decimals = options.numberOfDecimals;
                var dec_point = options.decimalSeparator;
                var thousands_sep = options.thousandSeparator;
                var currencySymbol = options.symbol;
                
                var exponent = "";
                var numberstr = number.toString ();
                var eindex = numberstr.indexOf ("e");
                if (eindex > -1)
                {
                exponent = numberstr.substring (eindex);
                number = parseFloat (numberstr.substring (0, eindex));
                }
                
                if (decimals != null)
                {
                var temp = Math.pow (10, decimals);
                number = Math.round (number * temp) / temp;
                }
                var sign = number < 0 ? "-" : "";
                var integer = (number > 0 ? 
                  Math.floor (number) : Math.abs (Math.ceil (number))).toString ();
                
                var fractional = number.toString ().substring (integer.length + sign.length);
                dec_point = dec_point != null ? dec_point : ".";
                fractional = decimals != null && decimals > 0 || fractional.length > 1 ? 
                                   (dec_point + fractional.substring (1)) : "";
                if (decimals != null && decimals > 0)
                {
                for (i = fractional.length - 1, z = decimals; i < z; ++i)
                  fractional += "0";
                }
                
                thousands_sep = (thousands_sep != dec_point || fractional.length == 0) ? 
                                          thousands_sep : null;
                if (thousands_sep != null && thousands_sep != "")
                {
                for (i = integer.length - 3; i > 0; i -= 3)
                  integer = integer.substring (0 , i) + thousands_sep + integer.substring (i);
                }
                
                if (options.symbol == '')
                {
                return sign + integer + fractional + exponent;
                }
                else
                {
                return currencySymbol + ' ' + sign + integer + fractional + exponent;
                }
                //FIM DO CORPO DO PLUGIN        
                
        }
});